Steel retainer for percussive drills



Dec. 8, 1931. HAFFORD 1,834,945

STEEL RETAINER FOR PERCUSSIVE DRILLS Filed March 5, 1928 Patented Dec. 8, 1931 DANIEL J. HAFFORD, F CLEVELAND, OHIO, ASSIGNOR I DRILL COMPANY, OF CLEVELAND,

THE CLEVELAND ROCK OHIO srnnr. RETAINER non rnnoussrvn nRI s Application filed March The present invention is directed to improvements in steel retainers for percussive V drills.

Theprimary object of the invention is to 5 provide a device of this character constructed in such manner that the shock incident to the drill steel collar striking the retainer will be effectively absorbed, thus prolonging the life of the retainer.

Another object of the invention is to provide a device of this character so constructed that it is not necessary to employ bolts for securing the retainer to the front head of the drill, and further to provide means whereby 5 the shock absorbing springs will be enclosed and protected against injury.

While the drawings illustrate a preferred embodiment of the invention, it is to be understood that in adapting the means to meet 29 specific needs and requirements, the design may be varied and such other changes in the minor details of construction may be resorted to within the scope of the invention as claimed, without departing from the spirit thereof.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and the drawings hereto attached, in which,

Figure 1 is a side view partly in section.

Figure 2 is an end view.

Figure 3 is a fragmentary side view.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters. 7 Referring to the drawings, 1 designates the front head of a percussive drill in which is operatively engaged in the customary man- 10 ner, the shank 2 of the drill steel 3, said steel being provided with the usual collar 4.

Formed integral with the front head and diametrically opposite each other are longitudinally extending enlargements 5 which have overhanging shoulders 6 projecting outwardly from their upper ends. These enlargements are cored from their lower ends to provide longitudinal pockets 7, the lower ends of which are threaded for the reception of the screw closure plugs 8.

1928. Serial No. 259,319.

' c The outer sides with longitudinal of the pockets are provided slots 9 which extend from points near the shoulders 6 through the lower ends of said enla rgements, said slots opening into the pockets.

The steel retainer 10 consists of side arms 11 andan intermediate drill steel collar engaging yoke 12,.said side arms having their upper ends formed with inwardly directed shanks 13 which terminate in 14. The extreme upper ends of the side arms are flattened, as

at 15, for intimate engagement with the shoulders 6.

The heads 14 are received 7, at which time the shanks 13 are engaged in 14, the lower ends of which rest upon the plugs 8 which obviously maintain the parts in assembled relation. ends of the side arms 11 Intermediate the of the retainer are formed lugs 17, which, owing to the inherent resiliency in the slots 9 in in its operative position and with of the retainer,

are yieldably held hold the retainer the yoke order to 12 in advance of the collar 4 of the drill steel.

14 rest upon the upper ends Since the heads of the spring 16,

it will be apparent that when the collar 4 of the drill strikes the yoke 12 the shock will ing breakage of the parts.

be absorbed, thus prevent- Vhcn it is desired to remove the drill steel the retainer is grasped and pull ed laterally in order that k the lugs 17 will disengage the slots 9, thus permitting the yo ke to be moved a sufficient distance to permit the collar 4 to pass thereby without interference.

The springs 16 not only serve to yieldably resist the vertical downward movement of the retainer, but

also maintains the upper flattened ends of the side arms 11 yieldably engaged with the shoulders 6, thus aiding the lugs to positively hold the retainer in enclosed position.

It will be further noted that the slots 9 not only serve as but also as securin guides for the shanks 13, g means for the lugs 17.

rounded heads in the pockets Having thus described the invention, 1 claim:

The combination with the front head of a drill of enlargements upon the opposite sides thereof, said enlargements having pockets thereimithe walls of the enlargement-shaving slots therein which open intothe poekets, a drill steel retainer including side arms haV- ing shanks upon their upper ends, heads car- 10 riedi Ihy lthe" shanks. for" engagement in the pockets when the shanks engage'saidslots, plugs closing the lower ends of the poekets, coil springs mounted in-the'pockets-a-nd maintained therein by theplugs, said.springs having their upper ends engaged With said" heads,

' and -lugs carried by the side arms-oi .theretainer and maintained normallyengagedin the, slotskhythe inherent resiliency'of there- 7 tainer,.said lugs being-adaptedtoslide longi- 2O tudinally in theslots Whenrthe retainer -is moved longitudinally V 7 Y V V t In testimony whereof I afiix my signature.

uDANI EL'JL 5HAFEORD: 

